Compound Filter Switching for Shared Tx/Rx Bandwidth Control

Solution Overview

Problem

Conventional transceivers suffer from redundancy in filter components, leading to waste of chip area and power due to the need for different bandwidth parameters in receiver and transmitter filters, which conflicts with the goals of minimizing signal distortion and noise rejection.

Innovation Solution

A shared filter module that selectively switches between bandpass and low pass filter modes using a compound filter structure with a coupling controller, allowing the same module to function as either two independent low pass filters or a bandpass filter depending on the operational mode, thereby reducing component redundancy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If separate low pass filters with different bandwidth parameters are implemented for receiver and transmitter, then signal distortion is minimized and noise rejection is improved, but chip area and power consumption increase due to component redundancy

Engineering Contradiction:

Improvesignal qualityVSAvoidchip area

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The patent implements a universal filter structure that can function as both receiver low pass filter and transmitter low pass filter by using the same filter cells with reconfigurable coupling. The filter module is designed to be mode-independent, allowing it to serve multiple functions (receiver mode and transmitter mode) with different bandwidth requirements without requiring separate dedicated filters for each function, thereby reducing chip area while maintaining signal quality

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent employs dynamic reconfiguration of the filter structure through coupling controllers that can be enabled or disabled based on operational mode. In receiver mode, the coupling controllers are enabled to provide bandpass filtering with narrower bandwidth, while in transmitter mode, they are disabled to provide low pass filtering with wider bandwidth. This dynamic adaptability allows a single filter structure to optimize performance for different modes without requiring multiple fixed-configuration filters

Inventive Principle:

Principle #15Dynamics

2Reliability

If separate low pass filters with different bandwidth parameters are implemented for receiver and transmitter, then noise rejection is improved, but power consumption increases due to redundant filter components

Engineering Contradiction:

Improvenoise rejectionVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by stationary object

Solution Approach 1:

The patent implements a universal filter structure that can function as both receiver low pass filter and transmitter low pass filter by using the same filter cells with reconfigurable coupling. The filter module is designed to be mode-independent, allowing it to serve multiple functions (receiver mode and transmitter mode) with different bandwidth requirements without requiring separate dedicated filters for each function, thereby reducing power consumption while maintaining noise rejection performance

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent changes the operational parameters of the filter by dynamically enabling or disabling coupling controllers based on the operational mode. This parameter change allows the same filter hardware to achieve different effective bandwidths and filtering characteristics appropriate for receiver or transmitter operations, eliminating the need for multiple fixed-parameter filters and reducing overall power consumption

Inventive Principle:

Principle #35Parameter changes

3Area of stationary object

If a shared filter structure is used for both receiver and transmitter modes, then chip area and power consumption are reduced, but filter performance may be compromised due to mode-dependent operation

Engineering Contradiction:

Improvechip areaVSAvoidfilter performance

Core Design Contradiction:

Area of stationary objectVSReliability

Solution Approach 1:

The patent employs dynamic reconfiguration of the filter structure through coupling controllers that can be enabled or disabled based on operational mode. In receiver mode, the coupling controllers are enabled to provide bandpass filtering with narrower bandwidth, while in transmitter mode, they are disabled to provide low pass filtering with wider bandwidth. This dynamic adaptability allows a single filter structure to optimize performance for different modes without requiring multiple fixed-configuration filters

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent divides the filter into multiple identical filter cells (first, second, third, and fourth filter cells) that can be independently configured through coupling controllers. This segmentation allows flexible reconfiguration of the overall filter response by selectively enabling or disabling specific coupling paths, maintaining optimal filtering performance for different operational modes while using a unified hardware structure

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS7982533B2Transceiving system and compound filter

Publication Date: 2011.07.19 MEDIATEK USA INC

AI summary

A transceiving system utilizing a shared filter module is provided. The shared filter module is selectively filtering signals in a first band in a first mode and a second band in a second mode. The first mode is a receiver mode whereas the second mode is a transmission mode. The shared filter module comprises a compound filter comprising two low pass filters and a coupling controller to manage input and output wiring of the low pass filters. When the coupling controller is enabled in the first mode, the compound filter acts as a bandpass filter. When the coupling controller is disabled, the compound filter acts as two independent low pass filters.